Hi Dr.Shabir H Wani

Regarding your result  under isolation resulted in white types but few cobs were purplish in colour

I think that may be you need to do some chemical analysis  for cobs to know the macro and micro nutrient concentration.

Best regards

abdel

1. The kernel color (white, yellow, red and purple) is controlled through several alleles' interactions. Please see their interactions at below link. The cross might have re-shuffle some colored alleles together and change the color.

http://www.carolina.com/teacher-resources/Interactive/corn-ears-for-genetics/tr10691.tr

2. The movement of transposon element (inserting into these alleles) might also be possible.

Hi Shabir,

Were you trying to generate hybrid through making cross between Maize GM-6 and C-8?

I would suggest that your isolates were not entirely free of colored genes ,  further selfing of the isolates would be needed in order to rid the isolates of the purple genes